Automatic magnetic circuit-breaker.



No. 66l,l9 5. Patented Nov. 6, I900. W. M. SCOTT.

AUTOMATIC MAGNETIC CIRCUIT BREAKER.

(Application filed. July 22, 1899.)

(No Model.) 4 Sheets-Sheet I.

ITNES'SES: INVENTO/f fflW/d/I W Mali/ 4 m: Norms vzrzns co. PHoro-Lmm"\vAsr-mcron. D. c.

Patent'ed Nov. 6, I900.

W. M. SCOTT.

AUTOMATIC MAGNETIC'CIRGUIT BREAKER.

(Application filed July 22, 1899.)

4 Sheets-Sheet 2 (Nn- Iodel.)

WITNESSES:

THE Nomys PETERS 9o, Pno'roumo. msumnmw. n. c.

No. 66l,l95.' Patented Nov. 6, i900. W. M. SCOTT. AUTOMATIC MAGNETICCIRCUIT BREAKER.

. (Appliution filed July 22, 1899.) (No Indol.) 4 Sheets-Sheet 3.

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No: 66I,l95. Patented Novffi, I900. W. M. SCOTT. w

AUTOMATIC MAGNETIC CIRCUIT BREAKER.

(Application filed July 22, 1899.) Ho Iodel.) 4 Shear-Shoat 4.

UNITE STATES PATENT OFFICE.

WILLIAM M. SCOTT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE CUTTERELECTRICAL AND MANUFACTURING COMPANY, OF

NEW JERSEY.

AUTOMATIC MAGNETIC CIRCUIT-BREAKER.

SPECIFICATION forming part of Letters Patent No. 661,195, dated November6, 1900.

Application filed July 22, 1899. Serial No. 724,750. (No model.)

To all whom, it may concern:

Be it known that I, WILLIAM M. SCOTT, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and Stat-e ofPennsylvania, have invented a new and useful Automatic Magnetic Circuit-Breaker, of which the following is a specification.

My invention relates to automatic magnetic circuit-breakers in which areprovided an efficient main switch, a metallic switch supplemental and inshunt with the main switch, and improved carbon contacts forfinal break,and improved means for insuring the opening of the main switch prior tothe opening of the shunt-switch and the closing of the main switchsubsequent to the closing of the shunt-switch.

Referring to the drawings, Figure 1 is a front elevation of my device inthe closed position. Fig. 2 is a side elevation of the same. Fig. 3 is aside elevation of my device in the open position, with part broken away.Fig. 4 is a horizontal section on line was of Fig. 2.

Similar numerals refer to similar parts throughout the several views.

The main switch 6 is movably mounted on the horizontal rods 7 and 8 andproperly insulated therefrom and is adapted to cooperate with the fixedcontacts 9 and 10 to make and break circuit. The rod 11 is pivotallysecured to the switch 6 and constitutes one member of a toggle, theother member being the hand-lever 12, pivoted at 13 to a part of theframework of my device. The two togglemembers are connected by means ofthe pivot 14, secured to the hand-lever 12 and passing through the slot15 in the rod 11. This slot is adapted to permit of preliminary movementof the hand-lever 12 to cause the closing of a supplemental switchbefore the actuation of the main switch 6, as will be hereinafterdescribed.

The movable bridge 16 and the fixed contacts 17 and 18, with which it isadapted to cooperate, constitute the supplemental switch Said bridgev 16is carried at the free end of the arm 10,

in shunt with the main switch.

edges 25, adapted to cooperate with the antifriction-rollers 21, securedto the projections 22 of the hand-lever 12. Said cam edges are sodisposed with respect to the rollers 21 that the operation of thehand-lever in one direction will cause the closing of the supplementalswitch, while its operation in the other direction will permit the arm19 to respond to the actuation of the spring-piston 23 (shown in Fig. 2)to cause the opening of the supplemen tal switch.

It will be noted that in moving the handlever 12 in the upward direction(indicated by the arrowin Fig. 2) the rollers 21 immediately begin tooperate upon the cam edges 25 and cause the closing of the switch 16before the pivot 1% has traveled the length of the slot 15 and causedthe closing of the main switch 6. After the switch 6 is closed theremainder of the cam edges 25 (along which the rollers 21 must travel incompleting the movement of the hand-lever to close the main switch)conform to the arc of a circle, the center of which corresponds with thecenter of pivot 13, so that said further movement of the hand-leveroperates to maintain the arm 19 and switch 16 in the closed positionwithout causing further motion thereto, and corn sequently upon thereverse movementof the arm 12 no movement of arm 19 is permitted untilthe rollers 21 have traversed the are portion of the cam edges 25, abovedescribed, when the pivot 14: has then traveled sufficiently to permitthe switch 6 to respond to the actuation of spring-piston 24: to causethe opening of said main switch.

The hand-lever12 is normally restrained in a closed position, as shownin Figs. 1 and 2, by the latch 27, which engages with theantifriction-roller 28, (shown in Figs. 1 and 1,) secured to hand-lever12. The springpiston is adapted to increase the efficiency of latch 27.The movable core 31 upon a predetermined flow in its surroundingsolenoid 32 is adapted to actuate latch 27 to release the hand-lever 12to permit the opening of the switches in the manner above described. Thesprings 26 are adapted to quicken the movement of said hand-lever 12when the same is released.

My improved laminated bridge is made as follows: The lamina are ofmetal, and, as is best shown in Fig. 4, the end portions of theselaminae are formed approximately in circular arcs, the centers of thearcs formed by the inner and shorter laminae being closer to the insideedge of the bridge than the centers of those of the outer and longerlaminae. The result of this arrangement is to provide a separation fromeach other of the contacting edges of the laminae to allow room for playor over-travel in closing. The contacting edges of the laminae at eachend of the bundle thereof lie approximately in planes inclining towardeach other in the direction of the movement of the movable contact orbridge 6 to engage with the fixed contacts 9 and 10 that is, theengagement of thelaminated contact with the fixed contacts is somewhatin the nature of a wedge engagement. Said laminated movable contact isadapted to move in a restrained path to and away from engagement withthe fixed contacts.

Suitably secured to the fixed contacts 17 and 18 and the movable contact16 of the supplemental switch are codperating carbons and 34: for finalbreak. These carbons are pivoted at 35 and 36, respectively, andprovided with springs 37 and 38 and projections 39 and screws 42 asadjustable means for limiting the spring-actuated movement of thecarbons, which are so disposed that a fiat contact of the carbons ismaintained aft-er the shunt metal contacts have separated and until theyhave come sufficiently apart, when the carbons separate upon a line.

What I claim is 1. In an automatic magnetic circuit-breaker thecombination ofa main switch, a hand-lever for operating the movablecontact of same, a supplemental switch in shunt with the main switch, apivoted arm carrying the movable contact of the shunt-switch, thehand-lever adapted to act upon the pivoted arm by cam engagement toclose the shunt-switch, the hand-lever being connected to the movablecontact of the main switch with a certain amount of play to secure theclosing of the shunt-switch before that of the main switch, and theopening of the main switch before that of the shunt-switch.

2. In an automatic magnetic circuit-breaker the combination ofa mainswitch, a hand-lever for operating the movable contact of same, asupplemental switch in shunt with the main switch, a pivoted armcarrying the movable contact of the shunt-switch, the hand-leverprovided with a projection adapted to act upon the pivoted arm by camengagement to close the shunt-switch, means connected between thehand-lever and the main switch for closing the latterafter thehand-lever has closed the shunt-switch, and adapted to permit theopening of the main switch before the opening of the shunt-switch.

3. In an automatic magnetic circuit-breaker the combination of a mainswitch and a supplemental switch, each having a movable supportindependent of the other, spring means for actuating said switches and amanuallyoperative closing member having toggle-joint connection with themain switch and cam en gagement with the supplemental switch,substantially as described.

4. In an automatic magnetic circuit-breaker the combination of a mainswitch and a supplemental switch independently movable with respect toeach other, spring means for actuatingsame, a manually-operative closingmember having toggle-joint connection with the main switch and camengagement with the supplemental switch to cause the movement of thesupplemental switch first in closing and to permit the movement of thesup plemental switch first in opening the circuit, substantially asdescribed.

5. In an automatic magnetic circuit-breaker the combination of a mainswitch and a supplemental switch in shunt therewith, a pivotedhand-lever and a rod pivotally secured to the movable contact of themain switch and having also a pivot-and-slot connection with thehand-lever, apivoted member carrying the movable Contact of the shunt-switch and operated to hold it in the closed position by thehand-lever prior. to the closing of the main switch, and until after theopening of the same.

6. An electric contact member composed of metal laminae the outer endsof which are formed approximately in circular arcs, the centers of thearcs of the inner and shorter laminze being closer to the inside edge ofthe bridge than those of the outer and longer laminae, said laminaebeing separated and lying apart, toward and at their extremities orcontacting edges.

'7. An electric contact member composed of metal laminze, the outer'endsof which are formed approximately in circular arcs, the centers of thearcs, of the inner and shorter laminze being closer to the inside edgeof the bridge than those of the outer and longer laminae, said laminaebeing separated and lying apart toward and at their extremities orcontacting edges, said contact-faces of the laminae so disposed as tocooperate with the inclined surfaces of the fixed contacts which areinclined toward each other.

8. The combination with an electric main switch, of two cooperatingcarbon contacts for final break, each pivotally mounted andspring-controlled, and so disposed as to maintain a flat contact duringtheir entire engagement with each other until after the main switch hasopened, and then to separate upon a line.

9. In combination with an electric contact member, two cooperatingcarbon contacts for final break, each carbon havingindependent pivotalmountin l/VILLIAM M. SCOTT. Witnesses:

JNo. W. REEVE, J r., JNo. STOKES ADAMS.

